TS 12664-2

TS 12664-2 is a TSE standard for workplaces that convert road-vehicle fuel systems for operation with compressed natural gas (CNG) and liquefied natural gas (LNG). Its focus is the workplace environment that supports this activity: the building and layout, operating practices, personnel arrangements, and technical equipment are considered together as part of the conversion setting.

Technical and operational framework for conversion workshops

In these workplaces, converting a vehicle to natural-gas use is not only a matter of installing parts. It involves managing pressurised storage, gas connections, ventilation, electrical safety, maintenance arrangements, and other workplace controls as an integrated system. CNG and LNG belong to the same fuel family, but they differ physically: CNG is stored at high pressure, while LNG is kept in liquid form at cryogenic temperatures. In general technical terms, that difference affects both workshop design and the type of equipment needed. The standard provides guidance for the workplace conditions expected in this kind of conversion activity.

Main areas covered by the standard

• Structural characteristics: the physical arrangement and configuration of the workplace
• Operating rules: general rules for how the activity is conducted
• Personnel-related provisions: the organisation and safe execution of staff duties
• Technical equipment: the equipment and supporting systems used for conversion

Although the scope text explicitly mentions CNG-focused conversion workplaces, the title also includes LNG, showing that the document is concerned with both common natural-gas vehicle-fuel pathways. The referenced standards point to related areas such as natural-gas equipment, pressure-containing components, electrical installations, lighting, and personal protective equipment, which indicates a whole-facility approach rather than a single-device requirement. In practice, TS 12664-2 provides a workplace-level framework for facilities that carry out natural-gas vehicle conversion work.